129980862 has 120 divisors (see below), whose sum is σ = 337953000. Its totient is φ = 37208160.

The previous prime is 129980821. The next prime is 129980869. The reversal of 129980862 is 268089921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129980869) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 372264 + ... + 372612.

It is an arithmetic number, because the mean of its divisors is an integer number (2816275).

Almost surely, 2^129980862 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129980862, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168976500).

129980862 is an abundant number, since it is smaller than the sum of its proper divisors (207972138).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

129980862 is a wasteful number, since it uses less digits than its factorization.

129980862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404 (or 384 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 129980862 is about 11400.9149632826. The cubic root of 129980862 is about 506.5548419149.

The spelling of 129980862 in words is "one hundred twenty-nine million, nine hundred eighty thousand, eight hundred sixty-two".